

package com.hazelcast.jet.impl.pipeline.transform;

import com.hazelcast.function.FunctionEx;
import com.hazelcast.function.ToLongFunctionEx;
import com.hazelcast.jet.function.TriFunction;
import com.hazelcast.jet.impl.pipeline.PipelineImpl.Context;
import com.hazelcast.jet.impl.pipeline.Planner;
import com.hazelcast.jet.impl.pipeline.Planner.PlannerVertex;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.Serial;
import java.util.function.Supplier;

import static com.hazelcast.jet.core.Vertex.LOCAL_PARALLELISM_USE_DEFAULT;
import static com.hazelcast.jet.core.processor.Processors.mapStatefulP;

public class MapStatefulTransform<T, K, S, R> extends StatefulKeyedTransformBase<T, K, S> {

    @Serial
    private static final long serialVersionUID = 1L;

    private final TriFunction<? super S, ? super K, ? super T, ? extends R> statefulMapFn;
    @Nullable
    private TriFunction<? super S, ? super K, ? super Long, ? extends R> onEvictFn;

    public MapStatefulTransform(@Nonnull Transform upstream, long ttl, @Nonnull FunctionEx<? super T, ? extends K> keyFn, @Nonnull ToLongFunctionEx<? super T> timestampFn, @Nonnull Supplier<? extends S> createFn, @Nonnull TriFunction<? super S, ? super K, ? super T, ? extends R> statefulMapFn, @Nullable TriFunction<? super S, ? super K, ? super Long, ? extends R> onEvictFn) {
        super("map-stateful-keyed", upstream, ttl, keyFn, timestampFn, createFn);
        this.statefulMapFn = statefulMapFn;
        this.onEvictFn = onEvictFn;
    }

    @Override
    public void addToDag(Planner p, Context context) {
        determineLocalParallelism(LOCAL_PARALLELISM_USE_DEFAULT, context, false);
        PlannerVertex pv = p.addVertex(this, name(), determinedLocalParallelism(), mapStatefulP(ttl, keyFn, timestampFn, createFn, statefulMapFn, onEvictFn));
        p.addEdges(this, pv.v, edge -> edge.partitioned(keyFn).distributed());
    }
}
